Locally, grizzlies make extensive use of avalanche chutes in search of foods such as sedges, grasses, cow parsnip and various bulb producing flowers. Aided by their long front claws and massive shoulder muscles, they rototill beds of glacier lilies and spring beauty to harvest nutritious bulbs and they excavate fat and protein rich Columbian ground squirrels from their burrows. In mid-summer, grizzlies often move to huckleberry patches in burned over forests to fatten on a diet rich in carbohydrates to prepare for winter.